// juzao/pages/productlist/productlist.js
Page({

    /**
     * 页面的初始数据
     */
    data: {
      baseURL:wx.baseURL,
      total:0,
      rows:[],
      brandSelected:{},///已选品牌
      brands:[],
      brandVisible:false,
      query:{
        key:'',///搜索关键字
        brandIds:'',
        sorted:0,
        pageNum:1,
        pageSize:10
      }
    },
    ///清空选择的品牌
    clearBrand(){
      this.setData({
        brandSelected:{}
      })
    },
    ///按品牌进行搜索
    confimBrand(){
      let brandIds = []
      for(let key in this.data.brandSelected){///取出选择的品牌id
        if(key && this.data.brandSelected[key]) brandIds.push(key)
      }
      this.data.query.brandIds = brandIds.join(',')
      this.refresh(()=>{
        this.setData({
          brandVisible:false
        })
      })
    },
    ///切换品牌选择状态
    changeBrand(e){
      let brandSelected = this.data.brandSelected
      let id = e.currentTarget.dataset.id
      brandSelected[id] = !brandSelected[id]//取反 切换选择状态
      this.setData({
        brandSelected
      })
    },
    ///切换品牌弹框
    changeBrandVisible(){
      let brandSelected = {}
      if(!this.data.brandVisible && this.data.query.brandIds){///打开品牌弹框
        ///按上一次选择结果初始化已选中品牌
        let brandIds = this.data.query.brandIds.split(',')
        for(let i = 0; i < brandIds.length; i ++){
          brandSelected[brandIds[i]] = true
        }
      }
      this.setData({
        brandVisible:!this.data.brandVisible,
        brandSelected
      })
    },
    ///输入搜索关键字
    inputKey(e){
      this.data.query.key = e.detail.value
    },
    ///修改排序方式
    changeSorted(e){
      let sorted = e.currentTarget.dataset.sorted
      this.setData({
        'query.sorted':sorted
      })
      ///刷新
      this.refresh()
    },
    ///重新加载
    refresh(next){
      this.data.query.pageNum  = 1
      this.data.rows = []
      this.data.total = 0
      this.getList(next)
    },
    detail:function(e){
      wx.navigateTo({
        url: '/pages/details/details?productId=' + e.currentTarget.dataset.id,
      })
    },
  
  
    return:function(e){
      wx.navigateBack({
        data:1
      })
    },
    ///获取品牌列表
    getBrands(){
      wx.get('/brands').then(res => {
        this.setData({
          brands:res
        })
      })
    },
    /**
     * 生命周期函数--监听页面加载
     */
    onLoad: function (options) {
      console.log(options)
      this.setData({
        'query.key':options.key || '',
        'query.brandIds':options.brandIds || ''
      })
      this.getBrands()
      this.getList()
    },
  
    /**
     * 生命周期函数--监听页面初次渲染完成
     */
    getList(next){
      wx.get('/products',this.data.query).then(res => {
        res.rows.forEach((item,index) => {
          item.img = wx.baseURL + item.productImgs.split(',')[0]
        })
        this.setData({
          total:res.total,
          rows:this.data.rows.concat(res.rows)
        })
        if(typeof next == 'function') next()
      })
    },
    onReady: function () {
  
    },
  
    /**
     * 生命周期函数--监听页面显示
     */
    onShow: function () {
  
    },
  
    /**
     * 生命周期函数--监听页面隐藏
     */
    onHide: function () {
  
    },
  
    /**
     * 生命周期函数--监听页面卸载
     */
    onUnload: function () {
  
    },
  
    /**
     * 页面相关事件处理函数--监听用户下拉动作
     */
    onPullDownRefresh: function () {
      this.refresh(()=>{
        wx.stopPullDownRefresh()
      })
    },
  
    /**
     * 页面上拉触底事件的处理函数
     */
    onReachBottom: function () {
      this.data.query.pageNum ++
      if(this.data.rows.length < this.data.total) this.getList()
    },
  
    /**
     * 用户点击右上角分享
     */
    onShareAppMessage: function () {
  
    }
  })